<?php

Yii::import('zii.widgets.CPortlet');

#doc
#	classname:	EventCalendar
#	scope:		PUBLIC
#
#/doc

class Calendar{
	var $date;
	var $year;
	var $month;
	var $day;

	var $week_start_on = FALSE;
	var $week_start = 1;// sunday

	var $link_days = TRUE;
	var $link_to;
	var $formatted_link_to;

	var $mark_today = TRUE;
	var $today_date_class = 'today';

	var $mark_selected = TRUE;
	var $selected_date_class = 'selected';

	var $mark_passed = TRUE;
	var $passed_date_class = 'passed';

	var $highlighted_dates;
	var $default_highlighted_class = 'highlighted';


	/* CONSTRUCTOR */
	function Calendar($date = NULL, $year = NULL, $month = NULL){
		$self = htmlspecialchars($_SERVER['PHP_SELF']);
		$this->link_to = $self;

		if( is_null($year) || is_null($month) ){
			if( !is_null($date) ){
				//-------- strtotime the submitted date to ensure correct format
				$this->date = date("Y-m-d", strtotime($date));
			} else {
				//-------------------------- no date submitted, use today's date
				$this->date = date("Y-m-d");
			}
			$this->set_date_parts_from_date($this->date);
		} else {
			$this->year		= $year;
			$this->month	= str_pad($month, 2, '0', STR_PAD_LEFT);
		}	
	}

	function set_date_parts_from_date($date){
		$this->year		= date("Y", strtotime($date));
		$this->month	= date("m", strtotime($date));
		$this->day		= date("d", strtotime($date));
	}

	function day_of_week($date){
		$day_of_week = date("N", $date);
		if( !is_numeric($day_of_week) ){
			$day_of_week = date("w", $date);
			if( $day_of_week == 0 ){
				$day_of_week = 7;
			}
		}
		return $day_of_week;
	}

	function output_calendar($year = NULL, $month = NULL, $calendar_class = 'calendar'){

		if( $this->week_start_on !== FALSE ){
			echo "The property week_start_on is replaced due to a bug present in version before 2.6. of this class! Use the property week_start instead!";
			exit;
		}

		//--------------------- override class methods if values passed directly
		$year = ( is_null($year) )? $this->year : $year;
		$month = ( is_null($month) )? $this->month : str_pad($month, 2, '0', STR_PAD_LEFT);

		//------------------------------------------- create first date of month
		$month_start_date = strtotime($year . "-" . $month . "-01");
		//------------------------- first day of month falls on what day of week
		$first_day_falls_on = $this->day_of_week($month_start_date);
		//----------------------------------------- find number of days in month
		$days_in_month = date("t", $month_start_date);
		//-------------------------------------------- create last date of month
		$month_end_date = strtotime($year . "-" . $month . "-" . $days_in_month);
		//----------------------- calc offset to find number of cells to prepend
		$start_week_offset = $first_day_falls_on - $this->week_start;
		$prepend = ( $start_week_offset < 0 )? 7 - abs($start_week_offset) : $first_day_falls_on - $this->week_start;
		//-------------------------- last day of month falls on what day of week
		$last_day_falls_on = $this->day_of_week($month_end_date);

		//------------------------------------------------- start table, caption
		$output  = "<table class=\"" . $calendar_class . "\">\n";
		$qwe=ucfirst(strftime("%B %Y", $month_start_date));
		$output .= "<caption>" . ucfirst(strftime("%B %Y", $month_start_date)) . "</caption>\n";

		$col = '';
		$th = '';
		for( $i=1,$j=$this->week_start,$t=(3+$this->week_start)*86400; $i<=7; $i++,$j++,$t+=86400 ){
			$localized_day_name = gmstrftime('%A',$t);
			$col .= "<col class=\"" . strtolower($localized_day_name) ."\" />\n";
			$th .= "\t<th title=\"" . ucfirst($localized_day_name) ."\">" . strtoupper($localized_day_name{0}) ."</th>\n";
			$j = ( $j == 7 )? 0 : $j;
		}

		//------------------------------------------------------- markup columns
		$output .= $col;

		//----------------------------------------------------------- table head
		$output .= "<thead>\n";
		$output .= "<tr>\n";

		$output .= $th;

		$output .= "</tr>\n";
		$output .= "</thead>\n";

		//---------------------------------------------------------- start tbody
		$output .= "<tbody>\n";
		$output .= "<tr>\n";

		//---------------------------------------------- initialize week counter
		$weeks = 1;

		//--------------------------------------------------- pad start of month

		//------------------------------------ adjust for week start on saturday
		for($i=1;$i<=$prepend;$i++){
			$output .= "\t<td class=\"pad\">&nbsp;</td>\n";
		}

		//--------------------------------------------------- loop days of month
		for($day=1,$cell=$prepend+1; $day<=$days_in_month; $day++,$cell++){

			/*
			if this is first cell and not also the first day, end previous row
			*/
			if( $cell == 1 && $day != 1 ){
				$output .= "<tr>\n";
			}

			//-------------- zero pad day and create date string for comparisons
			$day = str_pad($day, 2, '0', STR_PAD_LEFT);
			$day_date = $year . "-" . $month . "-" . $day;

			//-------------------------- compare day and add classes for matches
			if( $this->mark_today == TRUE && $day_date == date("Y-m-d") ){
				$classes[] = $this->today_date_class;
			}

			if( $this->mark_selected == TRUE && $day_date == $this->date ){
				$classes[] = $this->selected_date_class;
			}

			if( $this->mark_passed == TRUE && $day_date < date("Y-m-d") ){
				$classes[] = $this->passed_date_class;
			}

			if( is_array($this->highlighted_dates) ){
				if( in_array($day_date, $this->highlighted_dates) ){
					$classes[] = $this->default_highlighted_class;
				}
			}

			//----------------- loop matching class conditions, format as string
			if( isset($classes) ){
				$day_class = ' class="';
				foreach( $classes AS $value ){
					$day_class .= $value . " ";
				}
				$day_class = substr($day_class, 0, -1) . '"';
			} else {
				$day_class = '';
			}

			//---------------------------------- start table cell, apply classes
			$output .= "\t<td" . $day_class . " title=\"" . ucwords(strftime("%A, %B %e, %Y", strtotime($day_date))) . "\">";

			//----------------------------------------- unset to keep loop clean
			unset($day_class, $classes);

			//-------------------------------------- conditional, start link tag 
			switch( $this->link_days ){
				case 0 :
					$output .= $day;
				break;

				case 1 :
					if( empty($this->formatted_link_to) ){
						$output .= "<a href=\"" . $this->link_to . "?date=" . $day_date . "\">" . $day . "</a>";
					} else {
						$output .= "<a href=\"" . strftime($this->formatted_link_to, strtotime($day_date)) . "\">" . $day . "</a>";
					}
				break;

				case 2 :
					if( is_array($this->highlighted_dates) ){
						if( in_array($day_date, $this->highlighted_dates) ){
							if( empty($this->formatted_link_to) ){
								$output .= "<a href=\"" . $this->link_to . "?date=" . $day_date . "\">";
							} else {
								$output .= "<a href=\"" . strftime($this->formatted_link_to, strtotime($day_date)) . "\">";
							}
						}
					}

					$output .= $day;

					if( is_array($this->highlighted_dates) ){
						if( in_array($day_date, $this->highlighted_dates) ){
							if( empty($this->formatted_link_to) ){
								$output .= "</a>";
							} else {
								$output .= "</a>";
							}
						}
					}
				break;
			}

			//------------------------------------------------- close table cell
			$output .= "</td>\n";

			//------- if this is the last cell, end the row and reset cell count
			if( $cell == 7 ){
				$output .= "</tr>\n";
				$cell = 0;
			}

		}

		//----------------------------------------------------- pad end of month
		if( $cell > 1 ){
			for($i=$cell;$i<=7;$i++){
				$output .= "\t<td class=\"pad\">&nbsp;</td>\n";
			}
			$output .= "</tr>\n";
		}

		//--------------------------------------------- close last row and table
		$output .= "</tbody>\n";
		$output .= "</table>\n";

		//--------------------------------------------------------------- return
		return $output;

	}

}


class EventCalendar extends CWidget
{
	public function run ()
	{
	
		$date = ( isset($_GET['date']) )? $_GET['date'] : date("Y-m-d");		
		$calendar=new Calendar($date);
		
		$first_day = $calendar->year . "-" . $calendar->month . "-01";
		
		$next_year = date("Y", strtotime("+1 month", strtotime($first_day)));
		$next_month = date("m", strtotime("+1 month", strtotime($first_day)));

		
		$cal=$calendar->output_calendar();
		$next_cal=$calendar->output_calendar($next_year, $next_month);
		$this->render('calendar',array('outcal'=>$cal));
		$this->render('calendar',array('outcal'=>$next_cal));

	}

}

?>